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Flow Control -   DYNATORQUE Spurs and Miters

Spurs 

DYNATORQUE™ spur gear operators and assists are heavy duty, utilizing iron and steel components in their construction. DYNATORQUE Spur gears have two distinct applications: First, as add on, close coupled spur gear assists (torque multipliers) for DYNATORQUE's worm gear and bevel gear operator product lines. The added ratio provided by these products allows for reductions in handwheel sizing and/or handwheel rim pull effort. Secondly, they provide a stand alone, low ratio, non-self locking, torque multiplier, for small non-rising stem gate and globe valves and other non-self locking applications that require torque multiplication, such as small electric motor operators.

Miters

DYNATORQUE™ miter gears are heavy duty, utilizing iron and steel components in their construction. Like the spur gears above, DYNATORQE's miter gear boxes have been designed for two distinct purposes. Generally, this product is used as a add on, close coupled gear box that changes handwheel input shaft direction on DYNATORQUE’s worm gear and bevel gear product lines. Additionally, as a stand alone product, a miter may be used to change shaft direct (90 degrees) on any rotating member with compatible torque values and interface dimensions.

DYNATORQUE™ Spur and Miter Gears are suited for applications where maximum valve torque ratings have been accurately calculated. All units have been designed to withstand loads far in excess of their rated torques. Gear boxes in this category are totally enclosed, weatherproof and permanently lubricated. Units are suitable for use in all handwheel and chainwheel applications.
Model numbers that end in "A" are stand alone models that are not made to close couple to existing products. These models have input (handwheel shaft) and output shaft connections. Models that do not end in "A" are designed to close couple to DYNATORQUETM quarter-turn worm gear and bevel gear products. These models have input (handwheel) shaft connections and use the input shaft from the primary operator for their output shaft connections. Models that do not end in "A" are offered as component parts that are assembled to primary operators.

Materials
Unit housings and covers are iron, gears are carbon steel and heat-treated carbon steel, shafts are carbon steel with yellow zinc coating, shaft seals are Buna-N rubber, housing to cover seals are styrene butadiene, bushings are oil impregnated copper nickel steel alloy, bearings are tapered roller and needle type.
 
Model
Unit Wgt. LBS.
Max. Output Torque Lb.-In.
Gear Ratio
Turns for 90 Deg.
Std. Output Shaft
Std. Mounting Pattern
Mech.
Adv.
Qty. & Size
Bolt Circle
Miter Gears
25
3000
1:1
1
NA
(4).406
1.250x2.250*
.9
26
3000
1:1
1
1.000
.9
26
6000
2:1
2
NA
1.8
27
6000
2:1
2
1.000
1.8
Spur Gears
34
10000
4:1
4
NA
(4).406
1.250x2.250*
3.2
4:1A
36
10000
4:1
4
1.000
(4)1/2-13
2.00x2.750
3.2
37
12000
6:1
6
NA
(4).406
1.250x2.250*
4.8
6:1A
39
12000
6:1
6
NA
(4).406
1.250x2.250*
4.8
*Bolt patterns are offset to match standard spur and miter attachment patterns on faced operators. See product drawings.

Notes:
Formulas listed below will assist you in determining handwheels sizes and rim pull requirements based on your application.

To Find: Handwheel diameter for given output torque at a given rim effort.
Divide the output torque by the mechanical advantage and multiply the result by 2.
Then divide this result by the handwheel rim effort.

To Find: Rim effort for a given output torque with a given handwheel diameter.
Divide the output torque by the mechanical advantage and multiply the result by 2.
Then divide this result by the handwheel diameter.

Note: Handwheels are not included as part of the operator part list or price.
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